<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>黑彩白</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        body{
            min-width: 100vw;
            min-height: 100vh;
            background: linear-gradient(
            135deg,
            rgb(0,0,0) 0%,
            rgb(255,0,0) 14%,
            rgb(255,255,0) 28%,
            rgb(0,255,0) 43%,
            rgb(0,255,255) 57%,
            rgb(0,0,255) 71%,
            rgb(255,0,255) 86%,
            rgb(255,255,255) 100%);
        }
    </style>
</head>
<body>
    
</body>
</html>